Comment # 1 on bug 960268 from Petr Gajdos

You have truncated important lines (which you lead to create the *.conf):

[28-Dec-2015 12:52:07] ERROR: failed to open configuration file
'/etc/php5/fpm/php-fpm.conf': No such file or directory (2)
[28-Dec-2015 12:52:07] ERROR: failed to load configuration file
'/etc/php5/fpm/php-fpm.conf'
[28-Dec-2015 12:52:07] ERROR: FPM initialization failed

And it seems that is exactly what you are supposed to do as an admin what you
already have done -- copy the  php-fpm.conf.default to php-fpm.conf, go trough
it, set what you want to set and after that run fpm.

I do not see any bug here (feature at maximum).